Match the physical quantities with their correct SI units. List-I List-II (A) Planck's constant (I) kg m s - 2 (B) Torque (II) kg - 1 m 3 (C) Weight (III) m 2 kg s - 1 (D) Specific volume (IV) kg m 2 s - 2 The correct match is

A = III , B = IV , C = I , D = II

A = II , B = IV , C = I , D = III

A = IV , B = I , C = II , D = III

A = II , B = III , C = I , D = IV

EASY

Earn 100

What is sonar full form?

Important Questions on Physical World and Measurement

EASY

Physics>General Physics>Physical World and Measurement>Measurements of Physical Quantities

A spherometer has

20

threads per

cm

. Its circular scale has

100

divisions. The least count of the sphere is

EASY

Physics>General Physics>Physical World and Measurement>Measurements of Physical Quantities

Light year is a unit of

EASY

Physics>General Physics>Physical World and Measurement>Measurements of Physical Quantities

The prefix atto means

EASY

Physics>General Physics>Physical World and Measurement>Measurements of Physical Quantities

Match the physical quantities with their correct $SI$ units.

	List-I		List-II
(A)	Planck's constant	(I)	$kg m s^{- 2}$
(B)	Torque	(II)	${kg}^{- 1} m^{3}$
(C)	Weight	(III)	$m^{2} kg s^{- 1}$
(D)	Specific volume	(IV)	$kg m^{2} s^{- 2}$

The correct match is

EASY

Physics>General Physics>Physical World and Measurement>Measurements of Physical Quantities

Which of the following is not a unit of time?

HARD

Physics>General Physics>Physical World and Measurement>Measurements of Physical Quantities

A person in front of a mountain is beating a drum at the rate of

40

per minute and hears no distinct echo. If the person moves

90 m

closer to the mountain, he has to beat the drum at

60

per minute to not hear any distinct echo. The speed of sound is

EASY

Physics>General Physics>Physical World and Measurement>Measurements of Physical Quantities

The nearest star to our solar system is

4.3

light years away. The distance of this star in Parsec is (Mean distance between the earth and the sun

= 1.5 \times 10^{11} m

and one light year

= 9.46 \times 10^{15} m)

EASY

Physics>General Physics>Physical World and Measurement>Measurements of Physical Quantities

The dimension of light year

EASY

Physics>General Physics>Physical World and Measurement>Measurements of Physical Quantities

The moon subtends an angle of $57 \min$ at the base-line equal to the radius of the earth. What is the distance of the moon from the earth?
[radius of the earth $= 6.4 \times 10^{6} m$ ]